Roller-mandrel



(No Model.)

S. P. M. TASKER.

Patented Dec. 1, 1885.

FY m w UNITED STATES PATENT FFlClE.

STEPHEN P. M. TASKER, OF PHILADELPHIA, PENNSYLVANIA.

ROLLER-MANDREL.

SPECIFICATION forming part of Letters Patent No. 331,573, dated December1, 1885.

Application filed July 20, 1885.

T aZZ whom it may concern.-

Be it known that I, STEPHEN P. M. TASKER, a citizen of the UnitedStates, residing in the city and county of Philadelphia, and State ofPennsylvania, have invented an Improvement in Mandrels for ManufacturingMetal Tubes, of which the following is a specification.

My invention relates to a class of mandrels in which the head, ball, ormandrel proper is provided with a pair of ellipsoidal frictionrollswhich are so mounted as to have their axes in parallel planes and tobear and roll upon each other at their central portion, and

the diameter of each of which is one-half of the internal diameter ofthe tube to be rolled.

A mandrel of the foregoing class was invented by me and patented to mein and by Letters Patent of the United States No. 151,323, dated May 26,187 4, to which Letters Patent reference is to be made for a more fullunderstanding of this improvement. The intention of the employment of amandrel of the foregoing class is to obviate friction between theinterior surfaces of the tube and the ball of the mandrel, and to permitof the more ready passage of the tube over the mandrel and withdrawal ofthe mandrel from the tube.

The object of my present invention is to provide a mandrel of theforegoing class the rolls of which cross each other at an angle that isto say, have their respective longitudinal axes so disposed as to crossor be inclined to each other, and which are capable of adjustment theone with respect to the other, as opposed to being fixedly parallel.

My mandrel is especially designed for employment in connection withcertain apparatus for manufacturing tubes in which a set or pair or aseries of sets or pairs of rolls, each of which sets is composed of twoconcave-faced rolls arranged one above the other, with their axes at anangle or arranged to cross, is or are employed for rolling down a tubeupon a mandrel, the said machine constituting the subj ectmatter ofseveral applications for patents executed by me and filed in the UnitedStates Patent Office contemporaneously with this application.

Apparatus embodying a good form. of my invention is represented in theaccompany- Serial No. 172,046. (N 0 model.)

ing drawings, and described in this specification, the particularsubject-matter claimed as novel being hereinafter definitely specified.

In the accompanying drawings, Figure 1 is a top plan view of a mandrelembodying my invention. Fig. 2 is a central vertical longitudinalsectional elevation of the mandrel of Fig. 1 in the plane of the dottedline a: 00 of Fig. 1, and sight being taken in the direction of thearrows upon said lines. Fig. 3 is a central vertical sectional faceelevation in the plane of the dotted line Y Y of Fig. 1, and sight beingtaken in the direction of the arrows upon said line, the rolls, however,not being in section, and a tube being represented upon them. Fig. 4 isa side elevation of the mandrel of Fig. 1 drawn to a smaller scale.

In all of the figures the rolls occupy what is assumed to be theirnormal position.

Similar letters of reference indicate corresponding parts.

In the drawings, A represents the mandrel-rod, upon which the mandrelproper is mounted, and by which it is, if desired, actuated.

' B B are a pair of equal-sized ellipsoidal or spherical cross-rolls,the diameter of each of which at the central portion thereof is equal toone-half of the diameter of the bore of the tube to be rolled. The rollscorrespond in size, shape, and general dimensions.

0 O are two roll-frames within which the rolls are respectivelyjournaled. The rollframes are conveniently of hollow cylindriform shape,and are fitted or socketed together by means of concentric beads 0 0*,which fit together after the manner of a socket or maleand-femaleconnection, and which permit of the frames moving upon each other abouta common center,which is a line coinciding with a central verticaldiametric line of the two rolls. Each of the roll-frames is convenientlyprovided with an extension in the nature of a lip or flange, which Ihave respectively designated as c 0 Each of these flanges is providedwith a segmental slot, 0 c, c 0 the slots being upon arcs of a circleconcentric with the circle of the roll-frames.

D is a master-bolt, which passes through the mandrel-rod, and upon eachside passes through the mandrel-slots of neighboring or opposite flangeson the roll-frames.

d is a nut upon said master-bolt, by means of which the said flanges canbe clamped upon the mandrel-rod in any desired position.

E is an auxiliary bolt, which passes through the segmental slots in thetwo flanges, which are longitudinally opposite to theflanges which bearupon the mandrel-rod. The said auxiliary bolt is provided with a nut, e,by means of which the said last-mentioned flanges can be clampedtogether in any predetermined position.

F is a tube upon the mandrel. The rollframes, as will be best understoodby a reference to Fig. 3, are, if I omit from consideration for themoment their flanges, together of the form of the segment of a sphereincluded between planes equally distant from a central diametrie planepassing between the two rolls, and the diameter of such portion of thesaid frames as constitutes the said spherical segment is slightly lessthan the combined diameters of the two rolls at their central portions,so that the surfaces of the said spherical segment are below the actingsurfaces of the rolls and not in contact with the tube, all as clearlyrepresented in Fig. 3. The rolls are each provided with axial studs,journals, or axles b 12*, which are either secured to the rolls andborne in fixed bearings in the respective frames or else are connectedfixedly with the said frames and entered within bearings in the rolls.

Such being a good construction of a mandrel embodying my improvements,it will be readily understood that in the normal set. of the parts, orthat represented in the drawings, the two rolls cross each other at anangle, and that by loosening the bolts D and E, which are normallytightened up, the respective rollframes can be moved, the one upon theother, about their common center of revolution, so as to permit of theangular adjustment of the rolls with respect to each other, the boltsbeing again tightened when any given adjustment has been effected, sothat therolls remain for action in their adjusted positions. In whateverposition the rolls are adjusted they bear upon each other at theircentral portion, so that the inward thrust of the tube upon them istaken off their journals and borne upon their central bodies.

It is obvious that the form of the roll-frames, and the means by whichthe said frames are fitted together and made adjustable the one upon theother, as well as the means by which the said frames are connected tothe mandrelrod, are immaterial to the invention, the gist of whichresides in the construction of a rollermandrel provided with two rolls,which cross each other at an angle.

In employing the said mandrel with a set of concave-faced rolls the axesof which are inclined to or cross each other the mandrel is to beinserted in the pass of the concavefaeed rolls, and the rolls of themandrels are to be adjusted so that their respective axes are parallelwith the axes of the rolls which they respectively operate in connectionwith, and when the said rolls are adjusted a similar adjustment topreserve the said parallelism of the axes is to be made in the rolls ofthe mandrel. I contemplate employing a series of mandrels of this classin connection with a series of rolls of the class referred to. It isobvious that if desired the frames can be so set that the rolls areparallel. It is obvious that the mandrel can be employed in connectionwith dies instead of rolls, and that it is adapted to be used for therolling of metal either hot or cold. "Where a series of these mandrelsare employed in connection with a series of rolls, it is preferable thatboth the mandrels and the rolls should be successivelydisposed at rightangles to their neighbors, so that every portion of the tube may besubjected to the action of the rolls upon the mandrels. tional, so as topermit of the ready application or removal of the rolls; but therolljournals may be entered through the frames from the outside, asshown in Fig. 1.

Instead of the bolts, other means of retaining the frames in differentadjusted positions can be readily employed.

' Having thus described my invention, I elaim- 1. The combination, in aroller-mandrel, of two ellipsoidal rolls the axes of which are inclinedto each other, substantially as set forth.

2. The combination, in a roller-mandrel, of two ellipsoidal rolls theaxes of which are inclined to each other, and a two-part frame, one partof which carries one roll, and the other part of which carries the otherroll, substantially as set forth.

3. The combination, in a roller-mandrel, of two ellipsoidal rolls theaxes of which are inclined to each other, a two-part frame, one part ofwhich carries one roll, and the other part of which carries the otherroll, and means for adjusting the position of the frames the one withrespect to the other, so as to alter the inclination of the axes of therolls, substan tially as set forth.

4. The combination, in a roller-mandrel, of two ellipsoidal rolls,roll-frames respectively carrying the said rolls, a mandrel-rod to whichsaid roll-frames are connected, means for securing the relativeadjustment of the said frames with respect to each other and withrespect to the mandrel-rod, substantially as set forth.

5. The combination, in a roller-mandrel, of the ellipsoidal rolls, theroll-frames respectively bearing the said rolls and adapted to have amovement about a common center, a mandrel-rod, and means for securingthe said frames in various adjusted positions with respect to each otherand said mandrel-rod, substantially as set forth.

6. The combination, in a roller-mandrel, of

The frames are conveniently made secthe ellipsoidal rolls B 13*, theframes O 0*, In testimony whereof I have hereunto the mandrel-rod A, andthe bolts D and E, signed my name this 6th day of July, A. D. 10substantially as set forth. 1885. e

7. The combination, in a roller-mandrel, of

5 the ellipsoidal rolls, the frames provided with STEPHEN TASKER"flanges having segmental slots, the mandrel- In presenceof rod, and theretaining-bolts, substantially as J. BONSALL TAYLOR, set forth. JOHN JOLLEY, J r.

